John b



Mount Vernon, in the county of Westchester UNITED sTA-rns PATENT oFFIoE.

JOHN B. BRENNAN, OF MOUNT VERNON, NEW YORK.

LOCK.

Specification of Letters Patent No.

To all whom t may concern Be it known that I, JOHN B. BRENNAN, of

and State of New York, have invented a new and Improved Lock fo-r Banks,Fireproof Safes, &c., and I do hereby declare that the following is afull, clear, and exact description of the same, reference being had tothe annexed drawings, making a part of this specification, in whichFigure 1, is a front view of the lock, the front casing or cap beingremoved in order to show the interior. Fig. 2, is a plan o-r top View ofthe casing of ditto. Fig. 3, is a detached view of a box or casecontaining sliding tumblers, and a horizontal section of a revolving capthat works upon the outer part of said box or case, the revolving capbeing bisected through its center. This figure is a top view of the boxor case. Fig. 4, is a side View of ditto. F ig. 5, is a detached View ofthe swivel key of the lock. Fig. 6, is a horizontal sectionof dittotaken at the line (m) Fig. 5.

Similar letters of reference indicate corresponding parts in the severalfigures.

The nature of my invention consists in having a series of slidingtumblers, with recesses cut in them at each end at varying points placedbetween two arms, one of which is secured to the bolt of the lock andthe other to a bolt tumbler, the arms and sliding tumblers being soarranged as will be hereafter shown, that the bolt of the lock cannot bethrown back until the recesses in both ends of the tumblers are broughtin line with the arms above mentioned.

To enable others skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

A, Figs. 1 and 2 is the case of the lock which may be of any proper formand B is the bolt which works against the back casing of the lock in theusual manner.

C, Fig. 1 is a bolt tumbler having its fulcrum at (a). The bolt tumblerhas two arms (b) (c), the arm (Z9) has a small projection (d) at its endand on its under side which fits in recesses (e) (f) in the upper edgeof the bolt B as it is drawn in or out. The proj ect-ion (CZ) is shownby dotted lines. The arm (c) forms nearly a right angle with the arm(Z2) and is provided with a curved recess (g) the use of which will behereafter shown.

D is a rectangular boX or case secured in 11,885, dated November 7,1854.

the angle formed by the arms (b) (c) of the bolt tumbler C. The boxorcase is secured to the back casing of the lock and is rather placed inthe angle formed by the arms (Z2) (c). The box or case contains a seriesof sliding tumblers (7L) shown more particularly in Figs. 3 and 4, eachtumbler (h) is provided with a shank (i) which passes through acylindrical projection E attached to the case. Underneath or back of thetumblers (7L) there are springs (j) shown in Figs. 1, 3 and 4. Both endsof the sliding tumblers are provided with notches or saw teeth and arealso provided with recesses (lc) (l) which when brought in line allowthe bolt B to be operated as will be presently shown, see Figs. 3 and 4.

F is an arm attached to the bolt B and `projecting across one end of thetumblers (it), as shown in Figs. 1 and 3. The arm (c) projects acrossthe opposite ends of the tumblers (it) as shown in Figs. 1 and 3. Thearm F of the bolt B being at one end of the tumblers (h) and the arm (c)of the bolt tumbler at the opposite ends, see Fig. 1.

G, Fig. 1, is the spring of the bolt tumbler.

H is a revolving cap which tits over the cylindrical projection E, seeFigs. 1, 3 and 4. The cap is provided at its base with a bit orprojection (m) rwhich when the cap is turned acts against the bolttumbler, as will be presently explained. The `upperp`art of therevolving cap has an oblong slot (n.) cut through it with a circularaperture at the center of said slot, shown clearly in Fig. 1.

I is the key of the lock. The lower end of the key has a series of bits(o) of unequal lengths and corresponding in number to the slidingtumbler (h), see Fig. 5, and dotted lines in Fig. 4. The bits (o) aresecured to the key by a pivot or rod (p) and turn freely independentlyof the other portion of the key. On the other portion of thekeyimmediately above the bits (o) are projections (Q) (g) placed atopposite sides of the key as shown in Figs. 5 and 6.

Operation: We will suppose the lock to be in a locked state as shown inFig. 1. The key I is inserted in the oblong slot (n) and the bits (o)pressed against the Shanks (i) and the sliding tumblers (7L) are forcedback at varying distances corresponding to the different lengths of thebits (o) and as the recesses (k) (l) are cut in the ends of the tumblers(7L) at different points corresponding to the different lengths of thebits (o) the cap Hand the bits or projection (m) of the cap acts againstthe bolt tumbler 'C and throws t-he projection (d) on the under-f sideof the arm (Zn) out of the back recess',

(f )in the bolt B and-the arm (o) is thrown into the recess (Z) at oneend of the sliding tumblers, see dotted lines Fig. l. (The bit orprojection (m) then acts against the usual notch Vor gating on the boltand throws the bolt back, the arm It passing into 'the re-A cesses (7c)at one end of the sliding tumblers. The bits (o) on the 'key remainstationary within the cylindrical projection E while the other portionof the key isturned andj the projections (g) move `or turn thel cap H.When the bolt B is moved back the bit or projection on the cap I-Ipasses into the curved recess (g). A

By the above invention it will be seen that the lock is unlocked at oneoperation and with a single key.

The lock also is prevented from being picked by obtaining a pressure ofthe bolt B upon the tumblers (h) because the recesses (lo) (Z) k'in theends of the tumblers must. first be brought in line to allow the bolttum? bler C, or rather its arms to be freed from the bolt B, for if therecesses (l) at the ends of the tumblers (h) opposite the arm (c) arenot in line,`the arm- (c) cannot of course enter, and the other arm (b)cannot be freed from the recess (f) in the bolt B. There is no way thenof opening or unlocking the lock eXcept by the proper key.

The bolt tumbler cannot be operated upon except by turning the cap andwhen the cap is turned so that the bit or projection (m) actsl upon'thebolt tumbler, the oblong slot (ai) will be crosswis'eof the entranceinto `the cylindrical projection E and consequently the sliding tumblerscannot be operated upon. The swivelrkey I therefore is necessary vinorder to unlock the lock and v'eiscperiments cannot be made with falsoor lskeleton keys.

The lock is'eXtremeIy simple, not liable -to getout of' repair, andeconomical to manufacture, more so than any lockpretendingto be burglarproof with which I am v.acquainted or `have anyknowledge of.

I do not claim= thefsliding tumblers (7L) with lrecessesfcut `in them atvarying points for they vare well known and in common use, neither do Iclaim a key having bits or prongso'f unequal lengths for they have beenpreviously used, nor do I claim the bolt ytumblery C with its arm (c)attached irrespective of the arm F on the bolt B and the a arrangementof the sliding tumblers (L), but

What I do claim as new and desire to k,secure by Letters Patent, is,

cesses cut in them at each end and arranged and operating in the mannerand for the purpose substantially as herein shown and described.

JOHN B. BRENNAN.

Witnesses:

JOHN Gr. STEARNS,

D. TYLER.

